Heyel, C. (1969). Computers, office machines etc. Macmillan.
Chicago-čujuhus (17. p.)Heyel, Carl. Computers, Office Machines Etc. London: Macmillan, 1969.
MLA-čujuhus (9. p.)Heyel, Carl. Computers, Office Machines Etc. Macmillan, 1969.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.